The North Star will handle up to a 24" log. That''ll only fit in the front part of the box east-west format though.
However, I did most my splitting at about 20" and about a 1/4 of it at 12" or so.
The best burn times I've been able to get is loading three layers, bottom layer east-west long logs, 3 short logs in the middle layer north-south, then one or 2 more long ones on top for east-west. Doing this with seasoned wood gets me about 6-8 hours of real useful heat, enought to heat my 2400sqft place for that time before the temp i nhere starts to fall off.
However, I did most my splitting at about 20" and about a 1/4 of it at 12" or so.
The best burn times I've been able to get is loading three layers, bottom layer east-west long logs, 3 short logs in the middle layer north-south, then one or 2 more long ones on top for east-west. Doing this with seasoned wood gets me about 6-8 hours of real useful heat, enought to heat my 2400sqft place for that time before the temp i nhere starts to fall off.